• 作者： Lu, Wei-Ming; Hsu, Ruey-Chi; Chou, Hong-Shing
• 中文摘要： 本研究在探討菌體濃度對氣液相間氧的質傳係數K/sub L/a的影響。為了避免醪中物質的化學效應,以模擬菌-高嶺土及死麵包酵母菌(Saccharomyces cerevisiae)為實驗粒子,研究粒子濃度變化對流變性及 K/sub L/a的影響。在粒子的濃度介於 0-100g/l的範圍內,微量的粒子存在會使氣泡不容易結合而造成K/sub L/a及a的增加。但是在高粒子濃度時,由於流變性質的改變以及紊流速度受到粒子存在的影響而減小等因素,反而使K/sub L/及K/sub L/a呈現減小的趨勢。同時以氣-液相系統的Michael與 Miller的功率消耗相關式為基礎,推導出適合三相攪拌槽功率消耗的相關式:P/sub g/= 0.79(P/sub u//sup 2/ND/sup 3/.div.G/sup 0.56/)/sup 0.46/+0.038X.rho.N/sup 3/D/sup 5/
• 英文摘要： The effect of cell concentration on gas-liquid mass transfer coefficient, K/sub L/a, was studied by employing Kaolin powder as simulated cell, sterilized and active yeast. In most cases, K/sup L/a was observed to increase with an increase of cell concentration and then decreased once it reached a maximum. However, K/sup L/a decreased in the region of higher cell concentration as a result of bubble coalescence which resulted from the rising of the turbulence intensity dampening and a transformation in rheological behaviour. A correlation equation for gassed power consumption for three phase system is indicated from a power measurement taken in this study to be obtained as P/sub g/=0.79*(P/sub u//sup 2/ND/sup 3/.div.G/sup 0.56/)/sup 0.46/+0.038X.rho.N/sup 3/D/sup 5/
• 中文關鍵字： 氣體-液體質傳; K/sub L/a測量; 功率消耗; 三相反應器; 機械攪拌
• 英文關鍵字： Gas-Liquid Mass Transfer; K/Sub L/A Measurement; Power Consumption; Three Phase Reactor; Mechanical Agitation